Install required Rollup stuffs

```
npm install --save-dev rollup rollup-plugin-babel rollup-plugin-commonjs \
    rollup-plugin-copy rollup-plugin-node-resolve rollup-plugin-replace \
    rollup-plugin-uglify
```

Install required Babel stuffs

```
npm install --save-dev @babel/core @babel/plugin-transform-runtime @babel/preset-env @babel/preset-react @babel/runtime
```

Create the `rollup.config.js` file as defined below.

Add the following `npm` scripts:

```
  "build:rollup": "rollup --config",
```

If you run this with `NODE_ENV=production` (or in fact anything other than `development`), the resulting
code will be minified. The target defaults to `production`.